Researchers using data from the James Webb Space Telescope recently announced they had detected biosignature gases on planet K2-18b. A new analysis of the same data casts doubt on the earlier findings

The James Webb Space Telescope may have detected life-associated gas in the atmosphere of a far-off planet. The news is being greeted with both enthusiasm and skepticism.

A cosmic object spotted by the James Webb Space Telescope has flummoxed astronomers. Now, a research team has studied hundreds of these "little red dots" and found clues about their identity.

The galaxies' fanciful names belie their actual ages: In this case of the Penguin and the Egg, it’s the Egg that came first.

Data from the James Webb Space Telescope indicate that a galaxy known as GN-z11 has a supermassive black hole at its center — one that's far more massive than astronomers expected.

On Earth, clouds and rain are made of water. But the James Webb Space Telescope has found that on a planet called WASP-107b, the rain and clouds are made of sand.

A new image from NASA's James Webb Space Telescope reveals what Earth's sun could have looked like in its infancy.

A stunning new image from the James Webb Space Telescope shows a pair of actively forming stars. But many people are more curious about the tiny question mark visible toward the bottom of the frame.

Thanks to the James Webb telescope, we can now see the nebula with more clarity. As one expert says, "We always knew planetary nebulae were pretty. What we see now is spectacular."

Astronomers pointed the James Webb Space Telescope at a common kind of planet that's bigger than Earth but smaller than Neptune. What they saw wasn't what they expected.

At about 600 million years after the Big Bang, they're not the oldest galaxies the telescope has spotted. But they appear as developed as our Milky Way — far further along than researchers expected.

Astronomers are debating how quickly the observations of the Hubble Space Telescope and the James Webb Space Telescope should be made public.

One year ago, on Christmas Day, the James Webb Space Telescope was launched. Since it began collecting data, it has captured - in stunning detail - previously unobservable stars, planets and galaxies.

NASA says an extensive review of historical records found no evidence that Webb ever led or supported purges of government employees who were gay. But some astronomers think that's a pretty low bar.

Galaxies that existed soon after the Big Bang turn out to be surprisingly bright, a discovery that's both thrilled and puzzled scientists who study how the universe evolved over time.